This lecture was a retrospective of John Randall's career. The material he assembled to prepare for the lecture includes: correspondence with H. N. Barber about Randall's first interest in biophysics and Barber's use of X-ray photographs to study sperm, 1972 (2); correspondence with R. W. Douglas about X-ray diffraction research, 1972 (4); photocopies of correspondence with and about Rosalind Franklin, 1950-60 (20); correspondence with G. F. J. Garlick about luminescence research, 1972 (2); correspondence with Raymond Gosling about DNA research, 1972 (5); correspondence with Pauline Harrison about collagen research, 1972 (4); correspondence with A. C. T. (Tony) North about collagen research, 1972 (3); correspondence with A. R. Stokes about DNA research, 1972 (2); a letter from Maurice Wilkins, written from the United States, about biophysics research at King's College, London, 2 August [1945], and a letter from Wilkins about the award of the Nobel Prize, undated [1962].